78669133 has 4 divisors (see below), whose sum is σ = 78741180. Its totient is φ = 78597088.

The previous prime is 78669127. The next prime is 78669163. The reversal of 78669133 is 33196687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33196687 = 271 ⋅122497.

It can be written as a sum of positive squares in 2 ways, for example, as 7469289 + 71199844 = 2733^2 + 8438^2 .

It is a cyclic number.

It is not a de Polignac number, because 78669133 - 2⁹ = 78668621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78669133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78669113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34360 + ... + 36577.

It is an arithmetic number, because the mean of its divisors is an integer number (19685295).

Almost surely, 2^78669133 is an apocalyptic number.

It is an amenable number.

78669133 is a deficient number, since it is larger than the sum of its proper divisors (72047).

78669133 is a wasteful number, since it uses less digits than its factorization.

78669133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72046.

The product of its digits is 163296, while the sum is 43.

The square root of 78669133 is about 8869.5621650677. The cubic root of 78669133 is about 428.4841759888.

The spelling of 78669133 in words is "seventy-eight million, six hundred sixty-nine thousand, one hundred thirty-three".